Tax Evasion and Community Effects in Italy

I propose an analysis of tax evasion in Italy using the data collected by the website evasori.info. This site collects reports by random internet users of the transactions in which they were involved that, lacking any legal receipt, were hidden from the tax authority. I interpret this experiment as a test of the attitude towards tax evasion by the community in which the tax offender operates: less reported episodes are an indication of a more lenient attitude. Since a more lenient attitude of the community is a lower cost of evading taxes, a smaller number of reports must be associated to less tax evasion. I show that the data confirm this claim. I also show that the presence of younger, less educated individuals and the size of the irregular labor force are associated to a more lenient attitude towards tax evasion.Tax Morale, Tax Evasion Reports

Neighbors Matter: Causal Community Effects and Stock Market Participation

This paper establishes a causal relation between an individual's decision of whether to own stocks and average stock market participation decision of the individual's community. We instrument for the average ownership of an individual's community with lagged average ownership of the states in which one's non-native neighbors were born. Combining this instrumental variables approach with controls for individual and community fixed effects, a broad set of time-varying individual and community controls, and state-by-year effects, rules out alternative explanations. To further establish that word-of-mouth communication drives this causal effect, we show that the results are stronger in more sociable communities.

Household versus Community Effects: Who Really Pays More for Food?

One strand of literature shows a household's cost of food to vary with the household's own income and demographic characteristics. For example, low-income households may tend to purchase less costly bundles of food. However, a separate strand of literature also shows food prices to vary spatially with the characteristics of communities, such as real estate prices. In this study, a model is developed that unites these two strands. Simulations further illustrate the effect that a community's characteristics can have on a household's food budget, if the household lives in each of ten cities in the United States.Consumer/Household Economics,

A game theoretic model for digital identity and trust in online communities

Digital identity and trust management mechanisms play an important role on the Internet. They help users make decisions on trustworthiness of digital identities in online communities or ecommerce environments, which have significant security consequences. This work aims to contribute to construction of an analytical foundation for digital identity and trust by adopting a quantitative approach. A game theoretic model is developed to quantify community effects and other factors in trust decisions. The model captures factors such as peer pressure and personality traits. The existence and uniqueness of a Nash equilibrium solution is studied and shown for the trust game defined. In addition, synchronous and asynchronous update algorithms are shown to converge to the Nash equilibrium solution. A numerical analysis is provided for a number of scenarios that illustrate the interplay between user behavior and community effects

Community effects in regulation of translation

Certain forms of translational regulation, and translation itself, rely on long-range interactions between proteins bound to the different ends of mRNAs. A widespread assumption is that such interactions occur only in cis, between the two ends of a single transcript. However, certain translational regulatory defects of the Drosophila oskar (osk) mRNA can be rescued in trans. We proposed that inter-transcript interactions, promoted by assembly of the mRNAs in particles, allow regulatory elements to act in trans. Here we confirm predictions of that model and show that disruption of PTB-dependent particle assembly inhibits rescue in trans. Communication between transcripts is not limited to different osk mRNAs, as regulation imposed by cis-acting elements embedded in the osk mRNA spreads to gurken mRNA. We conclude that community effects exist in translational regulation

Educational Achievement of Immigrant Children in Western Countries: Origin, Destination, and Community Effects on Mathematical Performance

This paper explores the extent to which macro-level characteristics of destination countries, origin countries and immigrant communities can explain differences in the educational achievement of immigrant children. Using data from the 2003 PISA survey, we performed analyses on the mathematical performance of 7403 pupils with a background of immigration from 35 different origin countries in 13 Western countries of destination. Our cross-classified multilevel analyses show that cross-national and cross-group variance cannot be fully explained by compositional differences. Contextual properties of host countries, origin countries and communities also affect the educational performance of immigrant children. We show that the better educational performance of immigrant children in traditional immigrant receiving countries can be explained by strict immigration laws. We further find that the level of economic development of origin countries negatively affects immigrant children’s educational performance, and that children who have a background in more politically stable countries, perform better at school. Finally, we find that socioeconomic differences between immigrant communities and the native population and relative community size negatively affect immigrant children’s scholastic achievement.immigrant; educational achievement; cross-national comparison; PISA; origin country; destination country

Bird community effects on avian malaria infections

In community assembly processes, interspecific interactions play an important role in shaping community diversity, especially at the local scale. Changes in species richness or abundance can modify local infectious disease dynamics, either reducing or increasing the risk of transmission within the community. This study evaluates the effects of bird community on avian haemosporidians infections in a Neotropical region. Bird samples were collected from areas surrounding three dams, and molecular analysis were performed to identify blood-parasitic haemosporidia infecting the birds. Generalized linear models were used to analyze the relationships between the bird community and the prevalence, number of infections, and richness of avian haemosporidian lineages. Non-significant effects of bird community dominance and richness on the prevalence of avian parasites and the number of infections of Haemoproteus were found. However, there was evidence of an amplification effect. Host dominance was associated with the total number of infections, the number Plasmodium infections and the expected richness of Plasmodium lineages, while the expected richness of Haemoproteus lineages was associated with the richness of bird species. These findings highlight the role of host community dominance and richness in the dynamics of parasite infections, potentially influenced by the availability of competent hosts. This study contributes significantly to our understanding of blood parasite diversity in tropical birds within a relatively understudied region of South America.This research was funded by Empresas Públicas de Medellín (EPM) and the Universidad de Antioquia through the cooperation Grant CT-2017–001714. JMP was financed by the grant PID2020-118205GB-I00 from MCIN/ AEI/10.13039/501100011033 of the Spanish Ministry of Science and Innovation

Identity and environmentalism: the influence of community characteristics

This paper examines the influence of community characteristics on self-proclaimed environmentalism. We find that the composition of a community affects the likelihood that a person claims to be a strong environmentalist, even after controlling for individual characteristics and pro-environment behaviors. Individuals are more likely to definitely agree they are strong environmentalists if they live in areas where a large share of the population has post-graduate degrees and if they live in heavily Democratic areas or heavily Republican areas. These community effects occur only when individuals are predisposed to take on an environmental identity.identity; environmentalism; communicty effects

Disentangling Individual and Community Effects on Environmentally Sensitive Behaviors

A major criticism of the environmental behavior literature is the nearly exclusive focus on the role of attitudes and individual-level characteristics. Despite this concentration on individual-level causes, variation in environmental behavior remains. As individual behavior becomes an increasingly significant source of pollution, a better understanding of the influences individual behavior is critical to addressing environmental degradation. This research re-directs the focus on individual-level influences on environmental behaviors by building models examining the varying dimensions of environmental behaviors as influenced by community characteristics. This is accomplished by testing a series of hypotheses under the auspices of two theoretical frameworks: the neoclassical economic theory and a social contextual model of environmental actions. Using individual-level data from the 1993 and 2000 General Social Survey and MSA data from the U.S. Census and the Environmental Protection Agency, I estimate two-level hierarchical models for three environmentally sensitive behaviors (environmentally sensitive food consumption, environmentally sensitive automobile use, and environmental activism). Multi-level analyses yield models revealing significant associations between MSA measures and individual environmental behaviors. Objective environmental conditions, region of MSA and MSA education level are significantly associated with environmentally sensitive food consumption behaviors, environmentally sensitive automobile use, and environmental activism behaviors, though their influence assumes diverse forms. Among the community measures, MSA education level is the primary social process that produces change in all environmental behaviors. In each of the models, MSA education level exhibits effects on all three behavioral measures and significant cross-level effects on automobile use behaviors. Living in a well educated MSA, particularly in the West or Northeast suggests higher environmental participation. Region of MSA is also a characteristic that must be considered when evaluating environmental behaviors, particularly for those living in the West and Northeast. Theoretical conclusions suggest that individual environmental behavior decision making is not simply a market exchange, but social forces are at work in the individual decision-making process